help please.....Duratec Sandable Primer for mould surface.

Discussion in 'Fiberglass and Composite Boat Building' started by wind_apparent, May 23, 2009.

  1. wind_apparent
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    wind_apparent wind driven speed addict

    I am almost done with my male mould forms for my Sailpowered hydrofoil project and I want to coat them with Duratec sandable primer as my tool finish. I have never used this stuff before and have a couple of questions: Is this brush or rollable or do I have to shoot it? Are there any issues with humidity (some of these coatings have bonding issues even with low humidity levels). And Do I have to buff it all the way to gloss or would sanding to 400 or 600 do the job? Thanks.

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  2. ondarvr
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    ondarvr Senior Member

    I thought I answered this earlier, but it's not here now ??

    Brush or roller? sort of, but you would need put on too many coats to make it worth it, you'll sand through trying to get it level. Spraying is the only good method on something that size.

    Humidity will slow the cure, but it really shouldn't create a big problem.


    You don't need to buff it out, but it sands and buffs fairly easy, so after using 600 grit you should be able to buff out about 95% of the scratches.
     
  3. wind_apparent
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    wind_apparent wind driven speed addict

    Thanks, looks like I'll take it over to my buddies shop and shoot it, then sand it to 600 and call it good. How many coats is standard?
     
  4. ondarvr
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    ondarvr Senior Member

    No standard amount, you just need to put on enough coats so you don't sand through the high spots.
     
  5. Landlubber
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    Landlubber Senior Member

    Keep sanding till the surface is as you require without going through the Duratec, when you do go through, simply respraw and then use a guide coat of say black dust spray, sand that off and the surface is prepared.
     
  6. wind_apparent
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    wind_apparent wind driven speed addict

    Can I color the 1st or second coat with something and use that as a guide coat? I don't want to sand through because my painter lives about 45mins away. (I only want to move these things once, the hull tool is 260 pounds and I need to borrow a trailer to do it.) What could I color it with?
     
  7. In Theory
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    In Theory New Member

    I have used polyester tint (pigment) to modify gray to an almost black for use as a guide during sanding later.
     
  8. ondarvr
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    ondarvr Senior Member

    For what you need to do almost any type of pigment or gel coat will work to slightly change the color.
     
  9. gonzo
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    gonzo Senior Member

    With most things in life, you pay now or you pay later. If you don't buff the molds you will buff the hulls. A mold with a rough surface may cause problems to remove parts.
     
  10. ABBOTTCRAFT
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    ABBOTTCRAFT New Member

    I use Duratec Surfacing Primer on plugs as it produces a harder, glossier finish than sanding primer.. Sanding Primer is OK to buildup a surface but you will find that a final coat of Surfacing Primer will produce a better surface...
     
  11. wind_apparent
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    wind_apparent wind driven speed addict

    I'm talking about Sandable surfaceing primer, is there something different?
     
  12. ABBOTTCRAFT
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    ABBOTTCRAFT New Member

    here's a list of the primers for Hawkeye Industries website.. You will still need to sand the surfacing primer with fine paper & buff, it has the hardest surface of the primers listed below & will withstand more heat...


    Sealing, Fairing, Priming and Surfacing Application: Plugs, Patterns and Models


    **Duratec Polyester Base Primer (707-051 Tan)

    **Duratec Polyester Surfacing Primer (702-003 Black, 707-002 Gray, 714-002 White)

    **Duratec Polyester EZ Sanding Primer (702-060 Black, 707-060 Gray, 714-060 White)
     
  13. Doug Lord
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    Doug Lord Flight Ready

    Ondarvr, is something like duratec ok on epoxy resin?
     
  14. wind_apparent
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    wind_apparent wind driven speed addict

    Yup, that's the one I was going to use.....whats a good sanding schedule for this product? any tricks I should know about? I'm shooting it right onto freshly sanded 6oz glass, do I need a sealer or basecoat or anything?
     

  15. ABBOTTCRAFT
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    ABBOTTCRAFT New Member

    I have used it without a sealer & had no issues..
     
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